body {
    font-family: Arial, sans-serif;
    background-color: #f5f5f5;
    margin: 0;
}

.container {
    max-width: 600px;
    margin: 50px auto;
    background-color: #fff;
    padding: 20px;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
    border-radius: 8px;
}

h1 {
    color: #333;
}

form {
    margin-top: 20px;
}

.result {
    background-color: #dff0d8;
    padding: 10px;
    margin-top: 20px;
    border-radius: 4px;
}